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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b6ecc2f90377e266d23e90d2b7d45d40cb98e5f0bbbc2f948e5ed7df2b586b2' 
  AND token = 'IktGeTwbwxIKZqfdPyJjP93ljfpHPHJlUaWnoWK8jEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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