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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '415f8afa8f09129fe424394e595088ada412126fc61a8e02471b0e5d47711268' 
  AND token = 'KsVS/Mz0rTzlrQBfw3tt35gA446SCy6jrpT5bEIfVoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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