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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cb0475ec25f3fbbdfad662dc0c617c41d461c9f00edce636064fb1e4608279a' 
  AND token = 'Cf2l+8D3Lzk4F9wH5DZFf+FUrRszhgLrUC5yQn1xdis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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