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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2691a1ede1b393e89d8592ecdb11ec5f61c5fb8c0a0675dbbde50db4b0c2267d' 
  AND token = 'xcdfsxTwPzSqM1xkM1trnvWn0XiIDCML2N6ojPF5Ye4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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