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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93d63e7cde93d7ae0958e8cb5a14b07becbf25baa389a3b4e4b0c054ae80dc0' 
  AND token = 'NTW8YFWa57nHwGeb0G+ILiq7Tf6pbkH8S87USQ0UYN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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