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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5733ab0240aa0d2047f13860705c2fa18884dc5d52a126cff8c6b1d32076b96e' 
  AND token = '84dazIFzSaoLb3fXDk8B0MZNS3nssZIWOS3btRNMKGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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