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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c75192dae5c877d3e26954c9149c5f9e2c7bf718abc481796346285f3175929f' 
  AND token = '/dATHBaWtQ1etngD4BO9a5QI034hcUXiMpb9e0n2d+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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