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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '162ce6db2b70f8c9313eb2d83ef156b2b9b1f32e85f4b11bedf10a42c34eb17d' 
  AND token = 'einbQ3rufgjgQWBhDM0AZcADoczrdzEN9dR4Wo3JNAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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