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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edcff2e88784b1486e6922123056c7b4ed236cc5bfebfd5e6b8774e7cb76d1b8' 
  AND token = 's3yQNu7LFO3uArNPiafW4pKHjFBSmSRgRsQbLEp4ALg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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