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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '463ac89115fc707e189bf7da90d6b0be64f384f83a5d867467d865dfa1160ceb' 
  AND token = 'L8oQoVpeYVwXiu0C3r/vD0g/PpHvp8bS8ACEBQU8q2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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