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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f889663da07dba1de3eb7c66ce36fbaeb53dd90bfa900e40181b645b3fad4e7c' 
  AND token = 'IP9ZR/9cTdONKaz7L3W47Ton6N5MBjpVCUkp1yJLVcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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