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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd450e8f623500930336f0f90bea0b1320b8a93bf582ef331adc6872883e80944' 
  AND token = 'AglHmx3INWuxlJZQojPWaUQbU4cC0z8oGA0OgunEKeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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