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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7bd6188159bec1df15945565243a55350799ae7f25d8d81dcad4335c1e2b249' 
  AND token = 'zDTZWspbBPgtTErz/i0i2Tm0c6cp3uKlZDFKpN+RWvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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