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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9590ffe50ad03b40dfd144dfd5f44ecbffb1ee1b1c8be722f9d4edd396e14234' 
  AND token = 'WKZZO0SF0GeP02esTHa/ZhZUzrJ1sy85Nsgm1w2xcQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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