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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '819e24acc70d1bf724e12939e83b7119c95f2f0257799e9a4fb2481f414e858e' 
  AND token = 'HBOlkXnqy7aq/WjLUcs21iXNbg2XInMaKi7hVJIiSXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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