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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '781f550921b21f6f27710701758e21bac86cd71e4c6ecb8d4c62ed7873cc93a9' 
  AND token = 'SAtUl4rSToLAC4biTxNN2l0sieHcRHUSXAnEbOQjxzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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