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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bd5e05ba66548599704fbeb9d4c552e3309009b2e9e93adad8199f9d8d5a36d' 
  AND token = '8yaz2OvbmD4/lbJphFDJI0+ZedQ+IjHhZxpUUiYe5jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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