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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55412e8fab8f75b11c9649270831adf656b80736248420a6650630eae5273406' 
  AND token = 'JNVCmx3dV+oMfi+VMR30qvrzx3DvDq/KR6QIFvTia7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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