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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b18a4c5f9bae36a5c535466c375b2dee0ea10c854dea84c5d5223dd555407f' 
  AND token = '31zfg/nbaT5fTRq0VZVq7Cwj/rFfR7UqSBsalqr3hPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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