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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3120666d80d7f5ccf666c99efec588bcb2594d7b46920555ec82fd8aa684eaf' 
  AND token = '1XD1/jNIrd70ieFuimpcrcU2Dyoc10y0QHQJSOXyMDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}