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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caf88af62396d7a42c79cb31771f5db7270cdf2edc528839b80ce84f1c451c39' 
  AND token = 'CFK5C/puUIIRygfyOAAskvSWaZ3L+ZxIcRiB6ccbicg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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