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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae4f5d359486f1534eea8e330dafeb3f36d39c02ccba8181c168ba3c73e91fe7' 
  AND token = 'b8ZYHTnCBWuzBJ5HoVEetEKHmTjyHX93BTdActcASoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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