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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6057a71be2de0baf44252cb13e685b3bde65c9d8d73b4acd13ef0fd4afb3cb6' 
  AND token = 'MN/5JF9isMTb5IKc0bklr+20D4lYMhjfKd8NARzbVU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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