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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06a98b1b59745fa6515cae6d6d7ecf199833517ee63709be3526a045f3649cf8' 
  AND token = 'ipBbPNUluNc42CGpsTqn+6BfQ6muUZ7ADDqoldM6p/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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