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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcede10c12fa97fb51aca73e7d1d1ee87d56b44cecf404a40bea08ef72813881' 
  AND token = 'ZZzda03ry+8bNawa/CCqB/6kjhma0jlOd5qNXo1RdB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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