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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f3d98a94f6c864c81c5f5311c581c9002f4c1099ec6029c7506aa0ebeefe44a' 
  AND token = 'I5zsR//aVrlxNHIwGZf86FRm4KDI6wyFKHZLU7coxpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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