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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3447c280ef7400157105ed8562ada2e9abe5662b19dba892c5b8dde4912e03f' 
  AND token = 'rYSwnEyIeqkaAy1vgZ9H3KIudWeiG17oOd9DHfZRn5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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