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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e4c1fcb1eeeb6374cd50094ba2c6e306ae0d796754806d83ee313724fc4729d' 
  AND token = 'K949+tie9knDGbu3nGcCIim5sZhQ0GJCoBM7Sw9w0I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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