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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4e3a5b77a749c660904ceb78c824c2795c01d0523cc6b47488d4e10159220b9' 
  AND token = 'lLtVuoWH2vvDXyaoJYnnMQ53ekR+dKuwida9gbRVLMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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