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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8e83b898b44f2f3b305d40781ea22f11eb9192ced8ac066b1ad569a3b6c31d7' 
  AND token = 'jsvOqbERysM1oE9tpzx/RkyIqfKVfdwW1jyyLcoyOpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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