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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6792ba49325eb5a270bffe2ab34b73301e9755583955a594cc0857d21a978734' 
  AND token = 'G/dnEBKGvSEu0ck7oucMo3ny10sbpAWiK7QWywVAAG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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