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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f469b42694a9168e3e2ffe8de237132c9c7bc803752a98f858a3aa9af7a777eb' 
  AND token = 'f29n8+pzBzVTJt2ZO2mDICmWBS4QeHdB7NU68NvMsvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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