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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4bae244aeb2d67f11dc396c1af2d60dd8ba5600af477215392eb2d0a37883db' 
  AND token = 'QH4mZxGf8CC+E+BeqUyPo07mHrnjTrDffRoOF8Jn5w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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