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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14f25d24f51d3e373ee399214c9ce78b95d1e518ff53b6c156c35478fbe20bb3' 
  AND token = '1mUr4Qp6XAVub8yHG3LRGTL9kWa9fFT/MzebDIrXIq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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