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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17909b47e2955b7d078912c88be59dda3af3404e7a49ce44436c1a6b70083132' 
  AND token = 'tUinslCBTsYak8rGcEAqctnXckvMVATYWwvpJ+ldYys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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