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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b0a8ae9303c6bac36f5daccb0baceba2356aa3d47a77a7624d662ae11bd04f6' 
  AND token = 'AAg04YESwmk6xrCUsAi8HTn/JpaY/+yxbvEL7CrmS9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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