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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b14c99a2cbdf78dda9264634d1aa0085b705d9373ca4d4dfe1f89eef20a0b14' 
  AND token = 'ucjpJaWTIn38Z0REBFSpYOKxaW2ARrPK/2tqI0IwOr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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