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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '175fa00f42cea838c27ef5768a9ca9d80baf85713e7645fabd26163d5b87eef0' 
  AND token = 'gNwBMxJq3crJDQOOtFWlF9MxEF6nbPRkEK/gK2/tXg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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