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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf9b10fecafa2fe795eeb52600989274d87e548f1401a07f2ff9977dd7f7bb7' 
  AND token = 'A+vkujWw9cVxK07gPoktwUjOfKusd9gQSun+aNW4ykg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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