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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac4aa96eeae953cbf76cc15a4f571e10d04ffaf5644b735fb5d919dc8cac183' 
  AND token = 'gH+02SPltu8z2bNfq85l6aD7pVZxhwHFHc3P5TvYVX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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