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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6b26fac5522d2d9b2b29be4b630cfa6272282af18d55916e7392365ddaad52f' 
  AND token = '2raoNCB10lM8QSNBhrJEU+173edAliwf1fxPEnnLZ/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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