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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '853d97e2d89dcc2eabca95c82281205afa01187d53676db4dc8ec0f208275735' 
  AND token = 'ieLRYxp7P8YKk9AEgdy99gPOQhne14q5ds/7+/qZaIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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