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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88a1cba9ae3428e9023882b8ccecab471c89563513b0715b3b5eb1a6189b8790' 
  AND token = 'dchENE9sdMfTw0BkZa/UG8kOgJQn8C7+MdjUj+x2Ibg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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