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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b72db680490dfcc0b2d1b3872d8574d3a4382884a3e4f049b5f6c0e9808570f0' 
  AND token = 'orI3jHSb8bbCSfV/P08B3m9rnVvnzG7/5B+RilOngVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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