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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd16e9b690dc838024d8863edbba096a309d9c10264fe18e04e69a30d2545b767' 
  AND token = 'MB4n3iLTR8oTZI0LbcpK7rY5kNQhk1U95EzpI6LixfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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