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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68fc2fc6459c2bfc18998202bca25abd00599ae218f011c2304c4d6bd6cd41e0' 
  AND token = 'kCYy8qxVllNvj45tNBEZEqql5p+rJAAJet6pjuVLPV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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