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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc8e2eb84b23f6aeba210ee67871dcf83799820d7d00581be6e7442989130dd5' 
  AND token = 'UXSDJuEsZr2gggqYRof05+ANj3K9iJq5/c620crnFhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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