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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0067fc89460cdf589a4b9e333ed6eaabb1c01518919dd58f71db1b434e5dbb2' 
  AND token = 'cFJy5QkcgEWmGvjqSn7xsaEiwR+9jEfB7JPIS6SpYuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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