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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7497bbcc1ce2039a9ba0a6fb26def6aff49b2c47814879cb7a5a8ea37c4c6e10' 
  AND token = 'yjZf7uViupPihAJXX1i6vmMhOoreSu/TUul4c/Et6gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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