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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa4bee1cda213d8f78f29c96fbd4fd085e8147db699b1f473bbee6801d5e5f97' 
  AND token = 'WarF0z06E6xAcCyoAsKyLMGBmlZtijFbN8awrAnXi4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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