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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeae4694df0fbdaf4f954ede3c0483995480802aafa6ca58fe62d3c5d344747a' 
  AND token = 'u0lpFN2ztFnwwV9ai7xJ6yUmq/YKNbm1f62rWTNv/DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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