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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '013ba037b5ba5a37a2c1d558c25d1d6be493febc4d65da1cf34a638a5f49fd89' 
  AND token = 'ndh+E3hJgAwE15fLH12tOJO9VkwbRKWvMfD7QFdDRI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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