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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4741244926e374346c703f33e96f01154430b1d3e33c55d89a48cf62bf61abab' 
  AND token = '2TwQFO9LOWThELYCMcsP0Il1pzaNdHVyhz4QO4FNToo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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