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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea4111e7d5755bbb9db61b75f90698a2cd44a9a49cd2a2b92b9ccf306d9d2df0' 
  AND token = 'afzbeTUDn2KTt0QT1y968OisDUCcLFPH8O39FTGSkpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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