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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69db4c592b3b9865a5d734a5c1dcdca76630f0f3e2cc3a0c53bf514a8b2785b7' 
  AND token = 'H/DK+k2/JoqaT1OCiJ+qAitF4O2Ir6qbIzErZ1KxzDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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