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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd980a93d708d5443916d6dee28355bf01d9b795ba1d393b0f35c143d38840828' 
  AND token = 'Oq4DZ4qAJ1622kYYwNhU114ZDaskhulWVYrESQ4mCAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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