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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '339b89cce2615fe2d213511909b2d32d5956c1a37ca5022a0a9decb89abbd164' 
  AND token = 'LckiJtIpiofy2JhxC/sgEbPmbIjJ2oee5h1DnhwJUFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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