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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e89f3b247ce0f863dd65906fed4f0913cf1e6a22d06d13ad4e80d1d3f51af70c' 
  AND token = 'd5MEKJj+cYzTfZEV52i9iu/I5kllt3A01f+0agKFVBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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