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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa1f07895c949d9c4ac062a89bed6191ac1b2c0d45379c454d519e5e6205f1b' 
  AND token = 'huMxEB7msoK5Cd+W+3MSqP7iJ/2XKRmgacmxl7cO8cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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